GPLv2

The GNU Affero General Public License version 3 (AGPLv3) is a copyleft license nearly identical to the GPLv3. Both licenses have the same copyleft scope, but materially differ in one important way. The AGPLv3's Section 13 states an additional condition not present in GPLv2 or GPLv3: "Notwithstanding any other provision of this License, if you modify the Program, your modified version must prominently offer all users interacting with it remotely through a computer network (if your version supports such interaction) an opportunity to receive the Corresponding Source of your version by providing access to the Corresponding Source from a network server at no charge, through some standard or customary means of facilitating copying of software"...

Openness invites greater participation and it takes advantage of the shared energy of collaborators. The strength of openly created educational resources comes paradoxically from the vulnerability of the shared experience of that creation process. One of the leaders in Open Educational Resources (OER) is Billy Meinke, educational technologist at the University of Hawai'i at Manoa. The University's open creation model uses Pressbooks, which Billy tells me more about in this interview...